Slag chute structure

Abstract

This utility model discloses a slag flushing trench structure, including a slag flushing trench body. Several substrates are arranged adjacent to each other along the length of the slag flushing trench body. Each substrate is U-shaped and coaxially fitted within the slag flushing trench. Both ends of each substrate extend inwardly with U-shaped retaining edges perpendicular to the inner surface of the substrate. These retaining edges are coaxially arranged with the substrate. Anchors are provided on the inner surface of the substrate. A U-shaped inner mold is coaxially fitted within the substrate and supported by the anchors. A wear-resistant casting layer is cast between the substrate and the inner mold. Lifting lugs are provided on the top of the substrate. This utility model's slag flushing trench structure, by setting the substrate and integrally casting the wear-resistant layer, balances the dual requirements of "long service life" and "quick replacement," significantly reducing downtime and maintenance costs.

Description

Technical Field

[0001] This utility model relates to the field of blast furnace technology, and in particular to a slag flushing ditch structure. Background Technology

[0002] During blast furnace smelting, molten slag is discharged after being granulated by high-pressure water quenching through the slag flushing ditch. The slag flushing ditch is subjected to mechanical scouring from the high-temperature slag-water mixture at 800-1000℃, high-speed particles, and chemical erosion from alkaline slag water. Generally, after about 3 years of operation, the wear-resistant lining of the ditch will show penetrating wear, cracks, and water seepage, requiring blast furnace shutdown for inspection and replacement. Otherwise, it will lead to safety accidents such as deformation of the ditch steel plate, loosening of the foundation, or even local collapse.

[0003] There are two main construction methods for the wear-resistant layer of existing slag flushing trenches. One is the integral casting method: after welding anchor nails to the trench wall, an integral wooden or steel mold is erected on top, and corundum-silicon carbide low-cement wear-resistant material is poured on-site. This method is formed in one go, without transverse joints, and has excellent erosion resistance, with a service life of 4-5 years. However, the wear-resistant material is sintered with the trench wall as a whole. When replacing it later, it is necessary to use pneumatic picks, electric hammers, plasma cutting, and other means to remove the old lining. The slag cleaning time for a single trench can be as long as 20-30 hours, which is labor-intensive, generates a lot of dust and noise, and is prone to damaging the steel plate of the trench wall, directly delaying the blast furnace restart.

[0004] The second method is the prefabricated component splicing method: wear-resistant ceramic composite lining plates are prefabricated in the factory according to the groove dimensions and directly assembled on site. The gaps between the plates are sealed with wear-resistant putty of the same material. This method has a short construction period (≤6 hours), and dismantling only requires prying up the old plates, meeting the needs of rapid maintenance. However, there are a large number of transverse and longitudinal joints between the prefabricated components. The joint areas have low density and are preferentially hollowed out under the scouring of high-speed slag water. Generally, "linear" groove leakage will appear after 6 to 12 months, requiring frequent patching. The overall service life is less than 2 years, and the furnace still needs to be shut down when patching, which actually increases the cumulative downtime.

[0005] Neither of the two types of slag flushing channels mentioned above can simultaneously achieve both "long service life" and "quick replacement," and there is currently no technical solution that combines the advantages of both. Utility Model Content

[0006] The purpose of this utility model is to provide a slag flushing ditch structure.

[0007] The technical solution to achieve the purpose of this utility model is: a slag flushing ditch structure, including a slag flushing ditch body, wherein a plurality of substrates are provided inside the slag flushing ditch body, the plurality of substrates are arranged adjacent to each other in sequence along the length direction of the slag flushing ditch body, the substrates are U-shaped, the substrates are coaxially sleeved in the slag flushing ditch, both ends of the substrates extend inward along a direction perpendicular to the inner surface of the substrates with retaining edges, the retaining edges are also U-shaped, the retaining edges are coaxially arranged with the substrates, the inner surface of the substrates is provided with anchors, the anchors protrude inward from the retaining edges along a direction perpendicular to the inner surface of the substrates, a U-shaped inner mold is coaxially sleeved in the substrates, the inner mold is supported on the anchors, a wear-resistant casting layer is cast between the substrates and the inner molds, and a lifting lug is provided on the top of the substrates.

[0008] Furthermore, the top of the retaining edge is flush with the top of the substrate. This configuration ensures that the retaining edge, in the direction of the inner surface of the substrate, blocks the wear-resistant casting layer on the bottom and wall, facilitating the subsequent removal of individual substrates.

[0009] Furthermore, the top of the inner mold is positioned horizontally lower than the top of the base. This arrangement ensures, on the one hand, that the retaining edge of the base provides adequate protection against the wear-resistant casting layer; on the other hand, the top of the wear-resistant casting layer is also positioned lower than the top of the base, with the top of the base protruding outside the wear-resistant casting layer. This facilitates the positioning of the lifting lugs and the lifting operation of the base when a single piece of the base and its corresponding wear-resistant casting layer are removed or replaced.

[0010] Furthermore, the inner mold is provided with a push rod, which contacts the inner wall of the inner mold. The push rod presses against the inner wall of the inner mold to prevent the inner mold from bending and deforming inward under pressure, thus making the cast wear-resistant layer more regular.

[0011] Furthermore, the ejector pin is X-shaped, and it contacts both sides of the inner wall of the inner mold. The X-shaped ejector pin can not only press against both sides of the inner mold simultaneously, but also press against the upper and lower parts of both sides of the inner mold simultaneously.

[0012] This utility model relates to a slag-flushing trench structure. After installing a base body with end flanges and lifting lugs at the top within the main body of the slag trench, an inner mold is then installed. A wear-resistant casting layer is then poured between the base body and the inner mold. With this slag-flushing trench structure, after installing the base body with lifting lugs at the top, a lifting tool can be connected via the lifting lugs to remove the base body and the wear-resistant casting layer. Compared to the traditional integral casting method, this structure, which is directly cast within the main body of the slag trench, facilitates the removal of the base body and the wear-resistant casting layer, making the removal of the wear-resistant casting layer more convenient and efficient. In particular, when the wear-resistant casting layer is partially worn, the corresponding part of the base body and the wear-resistant casting layer can be removed and replaced, achieving "quick replacement." Furthermore, since the anchor protrudes inward from the retaining edge in a direction perpendicular to the inner surface of the substrate, the casting cavities between the substrates are interconnected, and the wear-resistant casting layers formed within each substrate are connected as a whole. This integral structure of the wear-resistant casting layer is seamless. Compared to wear-resistant casting layers formed by prefabrication with seams, the wear-resistant casting layer of this invention has no weak points on its surface, resulting in better overall erosion resistance, greater wear resistance, and a longer replacement cycle, achieving a "long lifespan." This invention's slag-flushing trench structure, by setting the substrate and integrally casting the wear-resistant casting layer, balances the dual requirements of "long lifespan" and "quick replacement," significantly reducing downtime and maintenance costs.

[0013] Furthermore, the slag-flushing trench structure of this utility model, by setting the baffles at both ends of the substrate, forms a trench within each substrate. With the trench structure having the baffles, on the one hand, the wear-resistant cast-in-place layer is thinner at the baffles at both ends of the substrate. When subsequently removing the substrate and the wear-resistant cast-in-place layer within it, the thinner wear-resistant cast-in-place layer between adjacent substrates is more easily broken and removed. This facilitates the detachment of the substrate and the wear-resistant cast-in-place layer from the main body of the slag trench, making the removal of the substrate and the wear-resistant cast-in-place layer easier, more convenient, and more efficient. On the other hand, the trench structure with the baffles can limit and constrain the wear-resistant cast-in-place layer within it, reducing the deformation caused by thermal expansion and contraction, and preventing cracks from forming due to thermal expansion and contraction, thus avoiding a decrease in the wear resistance and erosion resistance of the wear-resistant cast-in-place layer. Attached Figure Description

[0014] Figure 1 This is a top view of the main body of the slag ditch and several substrates of the slag ditch structure of this utility model; Figure 2 This is a three-dimensional structural diagram of the substrate of the slag flushing trench structure of this utility model; Figure 3 This is a cross-sectional view of the slag flushing ditch structure of this utility model; Figure 4This is a cross-sectional view of the substrate and wear-resistant casting layer of the slag flushing trench structure of this utility model along the length direction. Detailed Implementation

[0015] The preferred embodiment of the slag flushing ditch structure of this utility model will be described in detail below with reference to the accompanying drawings: like Figures 1 to 4 As shown, a slag flushing trench structure includes a slag flushing trench body 1. A plurality of substrates 2 are provided within the slag flushing trench body 1, arranged sequentially and adjacently along the length of the slag flushing trench body 1. Each substrate 2 is U-shaped and coaxially fitted within the slag flushing trench 1. Both ends of each substrate 2 extend inwardly with U-shaped retaining edges 21 perpendicular to the inner surface of the substrate 2. The retaining edges 21 are coaxially fitted with the substrate 2. Anchors 3 are provided on the inner surface of the substrate 2, protruding inwardly from the retaining edges 21 perpendicular to the inner surface of the substrate 2. A U-shaped inner mold 4 is coaxially fitted within the substrate 2, supported by the anchors 3. A wear-resistant casting layer 5 is cast between the substrate 2 and the inner mold 4. A lifting lug 22 is provided on the top of the substrate 2.

[0016] In this utility model, the slag flushing trench structure has a retaining edge 21 extending inward from the inner surfaces (bottom and wall) of both ends of the base 2 in a direction perpendicular to the inner surface of the base 2. The retaining edge 21 is the same as the base 2 and is also U-shaped. The retaining edge 21 is coaxially arranged with the base 2. The top of the two walls of the base 2 is provided with a lifting lug 22. The lifting lug 22 is used as a hook for the lifting tool, which facilitates the connection between the lifting tool and the base 2 and applies force to the base 2. When casting the wear-resistant casting layer 5, firstly, the substrates 2 are arranged sequentially along the length of the slag trench body 1 into the slag flushing trench 1, with adjacent substrates 2 adjacent to each other. Anchors 3 are installed on the inner surface of the substrates 2, extending inward from the inner surface of the substrates 2 and beyond the inner edge of the retaining flange 21. Then, the U-shaped inner mold 4 is placed inside the substrates 2, with the anchors 3 located between the substrates 2 and the inner mold 4, and the inner mold 4 supported by the anchors 3. Afterward, wear-resistant casting material is poured between the substrates 2 and the inner mold 4, and the wear-resistant casting material solidifies to form the wear-resistant casting layer 5. Once the wear-resistant casting layer 5 is formed, the inner mold 4 can be removed.

[0017] In this utility model, when the wear-resistant castable material is poured between the base 2 and the inner mold 4, the anchor 3 protrudes inward from the baffle 21 in a direction perpendicular to the inner surface of the base 2, and the casting cavities between the bases 2 are connected, so the wear-resistant castable layer 5 formed is integral. However, at the baffle 21, due to the presence of the baffle 21, the thickness of the wear-resistant castable layer 5 is thinner than at other locations.

[0018] In this utility model, the slag-flushing trench structure is subject to wear during use due to the high temperature and scouring effect of slag and iron. Specifically, the wear-resistant cast layer 5, particularly its bottom and the area where it connects to the side, experiences wear. After wear, the corresponding location of the base 2 is identified. Simple treatment is then performed on the wear-resistant cast layer 5 at both ends of the base 2, such as using a tool (like a pneumatic pick) to create holes in the wear-resistant cast layer 5 at both ends of the base 2, forming a break. Then, a lifting hook is attached to the lifting lug 22 of the base 2, and the corresponding location of the base 2 and the wear-resistant cast layer 5 are removed using the lifting hook. After removal, a new base 2 and inner mold 4 are installed, and the area is recast to form a new wear-resistant cast layer 5. This completes the replacement of a single base 2 and the corresponding location of the wear-resistant cast layer 5.

[0019] This utility model relates to a slag-flushing trench structure. After installing a base 2 with end flanges 21 and lifting lugs 22 at the top within the main body 1 of the slag trench, an inner mold 4 is then installed. A wear-resistant casting layer 5 is then poured between the base 2 and the inner mold 4. After installing the base 2 with the lifting lugs 22, a lifting device can be connected via the lifting lugs 22 to remove the base 2 and the wear-resistant casting layer 5. Compared to the traditional integral casting method, this direct casting structure within the main body 1 of the slag trench facilitates the removal of the base 2 and the wear-resistant casting layer 5, making the removal of the wear-resistant casting layer 5 more convenient and efficient. In particular, when the wear-resistant casting layer 5 is partially worn, the corresponding part of the base 2 and the wear-resistant casting layer 5 can be removed and replaced, achieving "quick replacement." Furthermore, since the anchor 3 protrudes inward from the retaining edge 21 in a direction perpendicular to the inner surface of the base 2, the casting cavities between the bases 2 are connected, and the wear-resistant casting layers 5 formed in each base 2 are connected as a whole. The wear-resistant casting layer 5 of the integral structure has no seams. Compared with the wear-resistant casting layer with seams formed by prefabrication, the wear-resistant casting layer 5 of this utility model has no weak points on its surface, has better overall erosion resistance, is more wear-resistant, and has a longer replacement cycle, achieving "long service life". The slag flushing trench structure of this utility model, by setting the base 2 and integrally casting the wear-resistant casting layer 5, takes into account the dual requirements of "long service life" and "quick replacement", significantly reducing downtime and maintenance costs.

[0020] Furthermore, the slag-flushing trench structure of this utility model, by setting the baffles 21 at both ends of the base 2, forms a trench within each base 2. With the trench structure having the baffles 21, on the one hand, the wear-resistant cast-in-place layer 5 is thinner at the baffles 21 at both ends of the base 2. When subsequently removing the base 2 and the wear-resistant cast-in-place layer 5 within it, the thinner wear-resistant cast-in-place layer 5 between adjacent base 2s is more easily broken and removed. This facilitates the detachment of the base 2 and the wear-resistant cast-in-place layer 5 from the slag trench body 1, making the removal of the base 2 and the wear-resistant cast-in-place layer 5 easier, more convenient, and more efficient. On the other hand, the trench structure with the baffles 21 can limit and constrain the wear-resistant cast-in-place layer 5 within it, reducing the deformation of the wear-resistant cast-in-place layer 5 due to thermal expansion and contraction, preventing cracks caused by thermal expansion and contraction, and thus avoiding a decrease in the wear resistance and erosion resistance of the wear-resistant cast-in-place layer 5.

[0021] In the present invention, the top of the baffle 21 is preferably flush with the top 20 of the base 2. This arrangement ensures that the baffle 21, on the inner surface of the base 2, blocks the wear-resistant cast layer 5 on both the bottom and the wall, facilitating the subsequent removal of individual bases 2.

[0022] In this utility model's slag-flushing trench structure, preferably, the top 40 of the inner mold 4 is positioned horizontally lower than the top 20 of the base 2. This arrangement ensures, on the one hand, that the retaining edge 21 of the base 2 provides adequate protection against the wear-resistant casting layer 5; on the other hand, the top of the wear-resistant casting layer 5 is also positioned horizontally lower than the top 20 of the base 2, with the top 20 of the base 2 protruding outside the wear-resistant casting layer 5. This facilitates the positioning of the lifting lug 22 and the lifting operation of the base 2 when a single piece of the base 2 and its corresponding wear-resistant casting layer 5 are removed or replaced.

[0023] In a preferred embodiment of the slag-flushing trench structure of this utility model, a push rod 6 is provided inside the inner mold 4, and the push rod 6 contacts the inner wall of the inner mold 4. The push rod 6 presses against the inner wall of the inner mold 4 to prevent the inner mold 4 from bending and deforming inward under pressure, making the cast wear-resistant layer 5 more regular. Under the pressing action of the push rod 6, the surface of the cast wear-resistant layer 5 is smoother.

[0024] In the slag flushing groove structure of this utility model, preferably, the push rod 6 is X-shaped, and the push rod 6 abuts against both sides of the inner wall of the inner mold 4. The X-shaped push rod 6 can not only press against both sides of the inner wall of the inner mold 4 at the same time, but also press against the upper and lower parts of both sides of the inner wall of the inner mold 4 at the same time.

[0025] In this utility model, the slag flushing trench structure has an anchor 3 that is Y-shaped or V-shaped.

[0026] In this utility model, the length of a single inner mold 4 can be the same as the length of the slag flushing ditch 1, and an inner mold 4 is provided inside the slag flushing ditch 1; the length of a single inner mold 4 can also be the same as the length of the base 2, and an inner mold 4 is provided for each base 2; the length of a single inner mold 4 can also be a multiple of the length of the base 2, and an inner mold 4 is provided for several bases 2.

[0027] For those skilled in the art to which this utility model pertains, several simple deductions or substitutions can be made without departing from the concept of this utility model, and all such deductions or substitutions should be considered to fall within the protection scope of this utility model.

Claims

1. A flusher chute structure comprising a flusher chute body, characterized by: The main body of the slag ditch contains several substrates arranged sequentially and adjacently along the length of the main body. Each substrate is U-shaped and coaxially fitted within the slag ditch. Both ends of each substrate have U-shaped retaining edges extending inwards in a direction perpendicular to the inner surface of the substrate. These retaining edges are coaxially arranged with the substrate. Anchors are provided on the inner surface of the substrate and protrude inwards from the retaining edges in a direction perpendicular to the inner surface of the substrate. A U-shaped inner mold is coaxially fitted within the substrate and supported by the anchors. A wear-resistant casting layer is poured between the substrate and the inner mold. Lifting lugs are provided on the top of the substrate.

2. The flush slag notch structure according to claim 1, characterized by: The top of the retaining edge is flush with the top of the base.

3. The flush slag notch structure according to claim 1, characterized by: The top of the inner mold is located at a horizontal position lower than the top of the base.

4. The flush slag notch structure according to claim 1, characterized by: The inner mold is provided with a push rod, which contacts the inner wall of the inner mold.

5. The flusher chute structure according to claim 4, wherein: The ejector pin is X-shaped and contacts both sides of the inner wall of the inner mold.

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